如何插入作为参数发送的字符串？

Question

我对文件系统的访问权限有限，我想像这样设置通用通知处理程序调用：

notificator.sh "apples" "oranges" "There were $(1) and $(2) in the basket"

notificator.sh内容：

#!/bin/sh
echo

并得到如下所示的输出：

"There were apples and oranges in the basket"

这可能吗？如何实现？如果它是一个内置的 sh 解决方案，我会更喜欢。我实际上试图通过 curl post 参数将结果字符串 ($3) 作为消息发送给电报机器人，但试图简化情况。

Answer 1

通过对您的 </code> 进行一些更改，我们可以轻松完成这项工作。 首先，让我们定义<code>、</code>和<code>：

$ set -- "apples" "oranges" 'There were ${one} and ${two} in the basket'

现在，让我们强制替换成 </code>: <pre><code>$ one= two= envsubst <<<"" There were apples and oranges in the basket

备注：

$(1) 尝试运行名为 1 的命令，并且可能会在您的脚本运行之前生成错误。请改用 ${var}。
为了让这个方法起作用，我们需要重命名 </code> 中的变量。 </li> <li><code>envsubst 是 GNU gettext-base 软件包的一部分，并且应该在 Linux 发行版中默认可用。

向 Charles Duffy 致敬。

脚本形式

考虑这个脚本：

$ cat script.sh
#!/bin/sh
echo "" | one= two= envsubst

我们可以执行上面的：

$ sh script.sh "apples" "oranges" 'There were ${one} and ${two} in the basket'
There were apples and oranges in the basket

作为替代方案（再次向 Charles Duffy 致敬），我们可以使用 here-doc:

$ cat script2.sh
#!/bin/sh
one= two= envsubst <<EOF

EOF

运行这个版本：

$ sh script2.sh "apples" "oranges" 'There were ${one} and ${two} in the basket'
There were apples and oranges in the basket

备选

以下脚本不需要envsubst:

$ cat script3.sh
#!/bin/sh
echo "" | awk '{gsub(/$\{1\}/, a); gsub(/$\{2\}/, b)} 1' a= b=

运行这个脚本加上我们的参数，我们发现：

$ sh script3.sh "apples" "oranges" 'There were  and  in the basket'
There were apples and oranges in the basket
$ sh script3.sh "apples" "oranges" 'There were  and  in the basket'
There were apples and oranges in the basket

如何插入作为参数发送的字符串？

How to interpolate a string that was sent as an argument?

shell

string-interpolation

command-line-arguments

脚本形式

备选